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The Federal Communications Commission (FCC) took the unprecedented step to approve the usage of TV white spaces, i.e., locally vacant TV channels, in 2012. This TV spectrum will present new opportunities for wireless access technologies and applications. The utilization of TV spectrum also comes with some technical challenges. One of the most fundamental is that how much capacity can be achieved in...
Driven by green communications, energy efficiency (EE) has become a new important criterion for designing wireless communication systems. However, high EE often leads to low spectral efficiency (SE), which spurs the research on EE-SE tradeoff. In this paper, we focus on how to maximize the utility in physical layer for an uplink multi-user multiple-input multiple-output (MU-MIMO) system, where we...
One important issue associated with spectrum management in heterogeneous cognitive radio network is: how to appropriately allocate the spectrum to the secondary senderdestination (S-D) pair for sensing and utilization. In this work, the authors investigate the spectrum allocation problem under a more practical scenario, taking the heterogeneous characteristics of both secondary S-D and PU channels...
This paper describes the implementation of Java Meeting Space (JMS), a generic, extensible framework and environment for developing synchronous collaborative applications. The JMS framework is based on a fully object-oriented replicated architecture where the application instances and management services are all replicated at each site. JMS provides basic CSCW coordination services: session management...
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